#include <iostream>		//cin, cout
#include <vector>		//vector
#include <algorithm>	//sort,min,max,count
#include <string>		//string,getline, to_string
#include <cstdlib>		//abs(int)
#include <utility>		//swap, pair

using namespace std;

int main() {

	string S;
	cin >> S;

	int N;

	for (unsigned int i = 0; i < S.length(); i++) {
		N = (i % 26) + 1;
		S[i] -= N;
		if (S[i] <= 64) {
			S[i] += 26;
		}
	}

	cout << S << endl;

	return 0;

}